Add-On Blocks Disappearing
Permalink 1 user found helpfulhttps://www.concrete5.org/marketplace/addons/media-library/...
"Fatal error: Call to a member function deleteBlock() on a non-object in /home2/jasonch2/public_html/kwbc/concrete/models/block_types.php on line 691"
I feel as if it keeps getting worse haha.
https://www.concrete5.org/marketplace/addons/media-library/support/...
Try refreshing your database schema.
EDIT: You won't see those add-ons in the Block Types list, if that was what you are referring to.
EDIT 2: Make sure the add-on has been installed correctly by going to yoursite.com/dashboard/extend/install/. If it shows up as installed, try a reinstall.